如何使用JSP从URL获取参数值

Question

我有一个像var =的值P+q+EvhE951eg/I5nz1vi/w2YpJdH+v/vSPaQNg/I=

我通过这个参数url一样

http://localhost/proj/home.jsp?var=P+q+EvhE951eg/I5nz1vi/w2YpJdH+v/vSPaQNg/I=

现在在home.jsp中我想使用var的这个值.但是当我这样做时

String var=request.getParameter("var"); var获取值

"P q EvhE951eg/I5nz1vi/w2YpJdH v/vSPaQNg/I="注意它替换+为space.

所以任何人都可以帮我解决这个问题.

Answer 1

尝试像这样编码参数：

class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        String param = "P+q+EvhE951eg/I5nz1vi/w2YpJdH+v/vSPaQNg/I=";
        System.out.printf("Orginal Param: %s\n", param);
        param = java.net.URLEncoder.encode(param, "utf-8");
        System.out.printf("Encoded Param: %s\n", param);
    }
}

输出：

Orginal Param: P+q+EvhE951eg/I5nz1vi/w2YpJdH+v/vSPaQNg/I=
Encoded Param: P%2Bq%2BEvhE951eg%2FI5nz1vi%2Fw2YpJdH%2Bv%2FvSPaQNg%2FI%3D